Cone bit



A. J. SIMPSON Oct. 1, 1929.,

coma BIT Filed March 22, 1928 \\\\\8 VIII/222714 latented Get. 1, 1929 PATENT OFFICE ARTHUR J. SIMPSON, OF HEALDTON, OKLAHOMA CONE BIT Application filed March 22,

This invention relates to bits for rotary well drillin apparatus, and more particularly to the type of bit known as the Hughes rock bit and comprising a body having a wash pipe extending vertically and centrally therethrough, cutting cones rotatably mounted at the lower end of the body, and reamers rotatably mounted at the sides of the body. The cutting cones are located directly below the discharge end of the wash pipe, and due thereto, the water, which is supplied to the bit under very high pressure, strikes the upper sides of the cutting cones and is deflected into contact with opposite sides of the hole being bored. This is objectionable for the reason that the deflection of the water causes the formation of cavities in the sides of the hole as the result of which the operator is in constant danger of losing the hole due to cave-ins, and for the reason that the deflection of the water retards the boring operation by preventing the full cutting effect of the water from being utilized.

The present invention has for one of its objects to improve this bit to the end that the stated objection thereto will be overcome, and to attain this end comprehends the provision of the bit with wash pipes so arranged as to permit the unobstructed passage of the water therefrom to the bottom of the hole, whereby to permit the full cutting etl'ect of the water to be utilized and to permit the hole to be bored without danger oi cave-ins and in a comparatively short time.

With the foregoing and other objects in view, the nature of which will appear as the description proceeds, the invention consists in the novel construction. combination and arrangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawing, wherein:

Figure 1 is a View in side elevation of the bit embodying my invention, the cutting cones being shown in dotted lines,

Figure 2 is a sectional view taken on the 1928. Serial N0. 263,919.'

vertical plane indicated by the line 22 of Figure 1,

Figure 3 is a sectional View taken on the horizontal plane indicated by the line 33 of Figure 1, and

Figure 4 is a sectional view taken on the horizontal plane indicated by the line 4ld t Figure 1.

Referring in detail to the drawing, 1 designates the body, 2 the cutting cones and 3 the reainers of the bit. The body 1 is made up from two lateral halves or sections which are connected together by bolts l. The cutting cones 2 are toothed and arranged in the recess 5 in the lower end of the body 1, and they are rotatably mounted upon spindles 6. The reainers 3 which are arranged in recesses 7 in opposite sides of the body 1, are rotatably mounted upon spindles 8. The cutting cones 2 engage each other at the vertical centers of the body 1, and their spindles 6 are arranged in a vertical plane situated at right angles to the vertical plane of the manner spindles 8. The parts of the bit thus far described are similar to the corresponding parts of the Hughes rock bit.

In accordance with the present invention, the upper end of the body 1 is reduced and externally screw threaded, as at 9, for the reception of a drilling collar, not shown. his end of the body is provided with an externally screw threaded stud 10 for the purpose hereinafter stated. The spindles 8 are arranged outwardly or late ally beyond the cutting cones 2, and they are held against rotation. with respect to the body 1. The terminals 8 of the spindles 8 are of non-circular formation in cross section and fitted in corresponding recesses 11 in order to hold the spindles against rotation with respect to the body 1, the recesses being formed in the terminal walls of the recesses 7. The spindles 8 are provided with aXial bores 12 for the reception of wash pipes 13 which extend from the upper end of the body 1 to the recess 5. The wash pipes 13 are supported within the body 1 by a washer 1 1 which rests upon the upper end of the body and surrounds the stud 10 as shown at 14?. The upper ends of the wash pipes 13 extend into the washer 14 and have screw threaded engagement with threaded openings 15 in the washer.

In assembling the device, the spindles 8 on which are mounted the reamers 3 are secured between the two parts of the body 1. The Washer 14 is then screwed on to the threaded stud 10 until the threaded openings 15 are brought into alinement with the openings in the body 1 formed by alined grooves 13 in the two halves of the body. The pipes 13 are then inserted into said openings from the lower end of the body 1 and through bores 12 and screwed into the threaded openings 15.

The wash pipes 13 are arranged outwardly or laterally beyond the cutting cones 2 in order to prevent the water issuing therefrom from striking the cutting cones and thus insure the direct and unobstructed flow of the water from the wash pipes to the bottom of the hole being bored. It will thus be seen that all. danger of forming cavities in the sides of the hole is avoided, that the danger of caveins is reduced to the minimum, and that the full cutting effect of the water is utilized. It will be further seen that, as the full cutting effect of the water is utilized, a hole may be bored in a comparatively short time and at minimum speed. As the reamer spindles 8 are held against rotation with respect to the body 1 and the wash pipes 13, the Wash pipes are not subjected to wear and distortion.

It should be understood that the drawing is merely illustrative and does not pretend to give exact proportions. Furthermore, the said drawing is illustrative of a preferred construction, it being my expectation that various changes and modifications may be made without departing from the spirit and scope of my invention.

What is claimed is:

1. A rotary drill bit comprising a body, cutting members at the lower end of the body, a washer mounted upon theupper end of the body, and wash pipes extending vertically through the body and having their upper ends secured to the washer.

2. A rotary drill bit comprising a body having its upper end reduced and externally screw threaded, a screw threaded stud extending upwardly from the upper end of the body, cutting members at the lower end of the body, a washer mounted upon the upper end of the body and surrounding the stud, and wash pipes extending vertically through the body and connected at their upper ends to the washer.

3. A rotary drill bit comprising a body provided in its lower end with a recess and provided in its opposite sides with recesses, 

